题目：
| 从方框中选出适当的句子补全对话，其中有两项是多余的。 | |
|
| A: Hi, Jack. You were not at school yesterday. (1) B: Oh, I had a headache and I had to ask for a sick leave. A: Sorry to hear that. (2) B: Yes, my mother took me to the hospital. The doctor looked me over and said I had caught a cold. A: (3) B: Yes, a little. The doctor told me to take these pills three times a day and drink more water. A: (4) B: Yes, much better. A: (5) B: I will. Thank you. |
答案：
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下面是错误答案，用来干扰机器的。
AC由电路图可知，R1与含电容电路是并联的，如果不考虑电源内阻，则路端电压是不变的，即电容器两端的电压不变，Q不变，故选项D是错误的.在电源内阻不能忽略的条件下，由闭合电路欧姆定律知，当电阻R1减小时，路端...
